KR100802688B1 - Dolly stopping and returning device for a collision test - Google Patents

Abstract

A dolly stopping and returning device for a collision test is provided to improve accuracy of a vehicle collision test and accomplish substantial durability of the device. A dolly stopping and returning device for a collision test includes a shock absorption piston(5), a main cylinder(7), a connection cylinder(9), an oil cylinder(11), a back push piston(15), and a return spring(17). The shock absorption piston has a rod projecting from a stopper fixed to a rail in an approach direction of a dolly. The main cylinder guides straight movement of a spool(5a) of the piston. The connection cylinder has a spool(9a) straightly movable opposite to the piston. The oil cylinder guides straight movement of a spool(9b) installed at the other end of the piston. The back push piston projects opposite to an approach direction of the projection. The return spring resiliently supports a rod of the back push piston to be directed inward.

Description

Dolly stopping and returning device for a collision test}

1 is a view illustrating a dolly stopper according to the prior art,

2 and 3 is a view illustrating a dolly stopper and return device for a crash test according to the present invention,

4 to 7 are views sequentially explaining the operation of the apparatus of the present invention in conjunction with FIG.

<Brief description of symbols for the main parts of the drawings>

One; Rail 3; stopper

5; Shock absorbing piston 7; Main cylinder

9; Connecting piston 11; Oil cylinder

13; Back pushy piston 15; Back Push Cylinder

17; Return spring 19; Oil tube

The present invention relates to a dolly stopper and a return device for a crash test, and more particularly, to a technology for stopping and pushing a dolly used in a crash test of a vehicle to an appropriate state.

The dolly conventionally used for crash testing of vehicles is stopped in the same manner as in FIG.

That is, as shown in FIG. 1, a stopper 504 as shown in a position where the dolly 502 running the rail 500 to stop the tow vehicle is mounted, and the stopper 504 is used for shock absorption. The rubber 506 is mounted to absorb the shock generated in the collision with the dolly 502.

The dolly 502 is connected to the towing wire 508 and is pulled, thereby towing the test vehicle and being separated from the towing wire 508 in front of the collision wall, and then colliding with the rubber 506 of the stopper 504 At this time, the stop position of the dolly 502 is often the same as the wheel position of the test vehicle, there is a problem that the dolly 502 affects the behavior of the test vehicle to reduce the accuracy of the test.

In addition, in the structure of absorbing the impact by the rubber 506 that is simply attached to the stopper 504 as described above, there is a problem that the rubber 506 must be replaced at any time due to frequent breakage of the rubber 506.

The present invention allows the stop position of the dolly to be sufficiently spaced apart from the test vehicle during the crash test of the vehicle, thereby further improving the accuracy of the vehicle crash test, as well as eliminating the need for frequent parts replacement with sufficient durability. The aim is to provide a dolly stopper and return device for a crash test.

In order to achieve the above object, the present invention provides a crash test dolly stopper and a return device comprising: an impact absorbing piston having a rod protruding from a stopper fixed to a rail in a direction opposite to a dolly approach direction; A main cylinder which guides the spool of the shock absorbing piston to linearly move and is filled with air therein; A connecting piston having a spool at one end which is linearly movable in the main cylinder to face the shock absorbing piston; An oil cylinder filled with oil therein to guide linear movement of the spool provided at the other end of the connecting piston; A back push piston provided so that the rod protrudes from the stopper in a direction opposite to the approaching direction of the protrusion; A back push cylinder installed to guide the spool of the back push piston to linearly move and provide oil pressure from the oil cylinder to the spool of the back push piston; And a return spring elastically supported so that the rod of the back push piston is directed toward the back push cylinder.

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Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 and 3, an embodiment of the present invention includes: an impact absorbing piston (5) in which a rod protrudes from a stopper (3) fixed to a rail (1) in opposition to an approach direction of a dolly; A main cylinder (7) which guides the spool (5a) of the shock absorbing piston (5) to linear movement and is filled with air therein; A connecting piston (9) having a spool (9a) provided at one end so as to be linearly opposed to the impact absorbing piston (5) in the main cylinder (7); An oil cylinder 11 which guides linear movement of the spool 9b provided at the other end of the connecting piston 9 and is filled with oil therein; A back push piston (13) installed so that the rod can protrude from the stopper (3) in opposition to the approach direction of the projection; It is installed to guide the linear movement of the spool 13a of the back push piston 13 and is formed to provide oil pressure from the oil cylinder 11 to the spool 13a of the back push piston 13. A back push cylinder 15; It comprises a return spring (17) elastically supported so that the rod of the back push piston (13) is directed toward the back push cylinder (15).

The main cylinder (7) and the oil cylinder (11) is made of one body as shown, the portion that guides the rod portion of the connecting piston (9) linear movement by itself the main cylinder (7) and the oil cylinder ( 11) can be partitioned.

The oil cylinder 11 was connected to the back push cylinder 15 from the oil cylinder 11 as shown.

The air filled in the main cylinder 7 has a compressible property. In the present embodiment, air is used, but other compressible fluids such as nitrogen gas may be used.

The oil of the oil cylinder 11 was used to represent an incompressible fluid. That is, other incompressible fluids such as water may be used instead of oil.

The spool 5a of the impact absorbing piston 5 and the spool 9a provided at one end of the connecting piston 9 have the same cross-sectional area, and the spool 9b provided at the other end of the connecting piston 9 is provided. The cross-sectional area is smaller than the cross-sectional area of the spool 5a of the impact absorbing piston 5, and the cross-sectional area of the spool 13a of the back push piston 13 is of the spool 9b provided at the other end of the connecting piston 9. It is formed smaller than the cross-sectional area.

In the present embodiment, the back push pistons 13 and the back push cylinders 15 are respectively arranged side by side on both sides of the main cylinder (7).

Looking at the operation of the present invention configured as described above with reference to Figures 3 to 7 as follows.

3 is an initial state in which the dolly has not yet collided. The back push piston 13 is a state in which the rod is recessed inside the back push cylinder 15 by the return spring 17. The piston 9 and the shock absorbing piston 5 are moved to the left as much as possible.

Of course, in this state, the rod of the shock absorbing piston 5 is in a state protruding toward the dolly much longer than the rod of the back push piston 13.

When the dolly collides, the impact absorbing piston 5 moves to the right as shown in FIG. 4 while compressing the air in the main cylinder 7 to a high pressure momentarily, thereby storing the collision energy.

Then, the pressure stored in the form of high pressure air in the main cylinder (7) as described above acts on the connecting piston (9), the connecting piston (9) while pressing the oil of the oil cylinder (11) as shown in FIG. Move.

The oil excluded from the oil cylinder 11 is supplied to the back push cylinder 15 so that the back push piston 13 protrudes while compressing the return spring 17 to strongly turn the dolly in the opposite direction as shown in FIG. 6. Pushed out.

After pushing the dolly as described above, each element is returned to the initial state of FIG. 3 by the action of the return spring 17 as shown in FIG. 7.

Particularly noteworthy in the above structure and series of operations, the main cylinder (7) used air as a compressive fluid as the medium, the oil cylinder (11) used oil as an incompressible fluid as the medium, the shock absorbing piston It is a size relationship between the cross-sectional area of the spool 5a of (5) and the cross-sectional area of the spool 9b of the other end of the connecting piston 9 and the cross-sectional areas of the spool 13a of the back push piston 13.

First, the use of the air and oil is when the shock absorbing piston (5) is delivered to the oil cylinder (11) directly by receiving the impact force by the dolly and not stored in the air, the dolly is sufficient energy to the shock absorbing piston (5) Before the delivery of the back push the piston 13 is pushed out to push the dolly is to prevent the phenomenon that the shock absorbing effect is also not made well, do not push the dolly backwards enough.

That is, at the beginning of the collision, the air is compressed to first absorb and store the energy transmitted from the dolly and stop the dolly, and then push the back push piston 13 with the stored pressure energy to push the dolly with strong force. It is.

In the series of pressure transfer actions as described above, the cross-sectional area difference of the spools 5a, 9b, 13a is such that even if the dolly moves the shock absorbing piston 5 in a relatively small stroke, the back push piston 13 is strong and large in stroke. To push the dolly out.

By using the collision test dolly stopper 3 and the return device as described above, by eliminating the interference between the test vehicle and the dolly during the collision test, the accuracy of the collision test is greatly improved, and the stopper 3 and The return device is free of breakable parts and can be used repeatedly in a repeated crash test without additional parts replacement.

As described above, according to the present invention, by allowing the stop position of the dolly to be sufficiently separated from the test vehicle during the crash test of the vehicle, the accuracy of the vehicle crash test can be further improved, as well as sufficient durability and frequent replacement of parts. To eliminate the need for

Claims (3)

A shock absorbing piston having a rod projecting from the stopper fixed to the rail in a direction opposite to the approach direction of the dolly; A main cylinder which guides the spool of the shock absorbing piston to linearly move and is filled with air therein; A connecting piston having a spool at one end which is linearly movable in the main cylinder to face the shock absorbing piston; An oil cylinder filled with oil therein to guide linear movement of the spool provided at the other end of the connecting piston; A back push piston provided so that the rod protrudes from the stopper in a direction opposite to the approaching direction of the protrusion; A back push cylinder installed to guide the spool of the back push piston to linearly move and provide oil pressure from the oil cylinder to the spool of the back push piston; Dolly stopper and return device for a crash test, characterized in that it comprises a return spring elastically supported so that the rod of the back push piston toward the back push cylinder. The method according to claim 1, The spool of the impact absorbing piston and the spool provided at one end of the connecting piston have the same cross-sectional area; The cross-sectional area of the spool provided at the other end of the connecting piston is smaller than the cross-sectional area of the spool of the impact absorbing piston; Dolly stopper and return device for a crash test, characterized in that the cross-sectional area of the spool of the back push piston is formed smaller than the cross-sectional area of the spool provided at the other end of the connecting piston. The method according to claim 1, The back push piston and the back push cylinder is a collision test dolly stopper and return device, characterized in that each two are arranged side by side of the main cylinder.

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